Skip cloud queries if we know we are offline.

Cloud queries are being retried indefinetely in drivefs backend when
offline, which is a separate bug, but at least we shouldn't even try if
we know that it won't work.

BUG=chromium:854481

Change-Id: I5b1f182bf532864d01fc2c47740e72af0feddad4
Reviewed-on: https://chromium-review.googlesource.com/1249425Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Sergei Datsenko <dats@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594935}

chrome/browser/chromeos/extensions/file_manager/private_api_drive.cc

@@ -48,6 +48,7 @@
 #include "google_apis/drive/auth_service.h"
 #include "google_apis/drive/drive_api_url_generator.h"
 #include "mojo/public/cpp/bindings/callback_helpers.h"
+#include "net/base/network_change_notifier.h"
 #include "services/network/public/cpp/shared_url_loader_factory.h"
 #include "storage/common/fileapi/file_system_info.h"
 #include "storage/common/fileapi/file_system_util.h"
@@ -825,10 +826,19 @@ void SearchDriveFs(
   drivefs::mojom::SearchQueryPtr search;
   integration_service->GetDriveFsInterface()->StartSearchQuery(
       mojo::MakeRequest(&search), query.Clone());
-  auto* raw_search = search.get();
-  raw_search->GetNextPage(base::BindOnce(&OnSearchDriveFs, std::move(function),
-                                         std::move(search), std::move(query),
-                                         filter_dirs, std::move(callback)));
+  if (net::NetworkChangeNotifier::IsOffline() &&
+      query->query_source !=
+          drivefs::mojom::QueryParameters::QuerySource::kLocalOnly) {
+    // No point trying cloud query if we know we are offline.
+    OnSearchDriveFs(std::move(function), std::move(search), std::move(query),
+                    filter_dirs, std::move(callback),
+                    drive::FILE_ERROR_NO_CONNECTION, {});
+  } else {
+    auto* raw_search = search.get();
+    raw_search->GetNextPage(
+        base::BindOnce(&OnSearchDriveFs, std::move(function), std::move(search),
+                       std::move(query), filter_dirs, std::move(callback)));
+  }
 }
 
 }  // namespace